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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f95d59309b0d21327e82b48fa463ae223f33a49aff12aca28c481e5c08a26ed3' 
  AND token = 'mrm8dk7p5nOgw+QJjnpf+UH51uBYQrcZDFuuTOmDv74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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