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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8e24e80090c191d11e1153f44910f6b74e09fed1fb40ded0e67fc41d7d4bc5e' 
  AND token = 'RqBfkE/u79rF6mU9Ij+TGYCPkJWISFgiQDu0eBI7jFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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