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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '018cb193855526b793e1926a527e2b0f00ad8a9853e81639942325f007eade51' 
  AND token = '9kp2CjFj87fHZOsscmNgrEdAu7zVjKKXHqr5KzoNJPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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