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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7dc1d00cd57bb07e4c6e8b1b11a1b16dab7dff3403b9224b1d2255a3b15e627' 
  AND token = 'yJvRDqz4bC8QmNo6QdbqHtkSM7NL/tRE7e9tT/6O7Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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