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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '398e2f84eb6947544c37b827594438bb162f5bbe57631a19ee303211247d3a4b' 
  AND token = 'r7il5dg42yrvG11sBW128yE0hnYX4dxtOMiXA88DSAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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