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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '844cedfe85e2c58d583f0c9259dc4a666d660b0db8c7e927901093aaa0bf0b8b' 
  AND token = '44HypbM/sjW+XzLNV78L8L1cT2AaRYbdFGgdGBNEqig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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