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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a26fc5bed547628d7fa1699102491214b2ed4ea12662d1c9829aff1964b3e8f' 
  AND token = 'sAxBmZUsN5MXyvrp2vHVa+E35U0x6vfrbvRZAaM3r30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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