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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36bb481fe45485c81b6a24294aac0071c4e7be5d3ff1bcb3ed76c6dbf9c7a9dd' 
  AND token = 'rSfM8/vYD5Mr8wePxj5jIWmSMI4XikwbOqw+R+B4Mzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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