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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf5a2d79882f2c6d826e1b60962b2bfd62ebb334e5b7d909a8ba40a4d7f71365' 
  AND token = '9a2ykZpktT9w6ooQv+4LmZDmMC8PJVytmYJG1IvpQ0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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