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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd86c62edee607512f90cc1b89f27d4251ad5d9a53e1be400261f30f59b28a8fb' 
  AND token = 'YY+3PyFTmGemoupuut8xjNtbOEpKEhZhCJ72du22XtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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