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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c44f12d771e20c42fde8f0556c538f7d58982a7944cd9cdf8999b5e17c03667' 
  AND token = 'hWLnCEIoNf6ErlJJPHHfqQ1Cfj68kZnhpAAg/YTChtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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