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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1073769097d109c4d7b131fdd12d799464d08774390acee20e25f03e85af2ac' 
  AND token = '2YUe120wzMGlfr12GNIUbD/H+z2mU6gohcfHgOLYi4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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