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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e379c4b89ce64328e6f79fde12c1f3a25bd2c131163f12d0fc0065aa35adbd52' 
  AND token = 'Kc3zfbpg8df9T/6mmnNXBVgavKrtrLL30zKqW9ty9Ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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