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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f66cd863efade9f74fd3a149fd081fdfbb82b8b7b9f7f4847ba5a25084c4be0e' 
  AND token = 'NgKmKiNAsfyAJXD/Fmx9CGAN/pj8JW2yeqBjyywc3O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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