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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c10d3fc0f05d6941fb785e9445e1d1a21ecc47a972f0be3c9f5c5f74a1a02ac' 
  AND token = 'L4dZa54FR2QZFIDHKVQ/IAwp10rTAkDygzbwAhVI0vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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