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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1903b4dd5134b54d6a9738eb32dce4b12e267a10738591fae975ef2b02db268' 
  AND token = 'EZOoxUxU/8qojh2DeqXEPepnE6ErR0zNAkpQfyvvdL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}