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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e648b2f13bf240111e48a08e87368820095a4d42e6ab5cd516cccff899572f9a' 
  AND token = 'NelRyv3OJUV+SA1yQdV0rryzOQLpf9lkAaS2Ruogv2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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