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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eacf8f8edf3d0bb2eaf3c0c8f76311e390029bb1142caec9e92e4752fc1193b3' 
  AND token = 'OIfpKDkmD7GsLCv6Lz07LtetAqKNRH8YMibCiCVpk9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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