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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2940ad00580a085ab221b79001932b217fbbebebb31b0f0e98a25ce2e74d57b' 
  AND token = 'T3lZQb4GLeW4/Qm3aHqYebNnkzrBHUHxAyMsPlbzr+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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