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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '133501dffc5df0f159a146ae96bbe7eac8d713d135d2951906158d3f31e11bc8' 
  AND token = 'ivdRQ+XzANI7sr5C82h85N7pzeXpQbXKBqzb+WESMUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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