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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10b9c5b28f3724f6c05d004acc7588e5bdad9608aed625ffabe177c081de7e13' 
  AND token = 'k6/rZr40iP9a8oNJeeWd3DdvYvVtHBlzecyWYLpamuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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