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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeaf7e3d4f449d404a8f6db2b4eb86e8eb5f58c0701f00faba15ee1ff54d2229' 
  AND token = 'uhPF5mqjuZWxjpWPyhLdTMA4BCYoj+tE6jxAlBD+Do8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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