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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd704831ad9360d0a8a27bbfa9bd2091296a36d3a2d27ce3c5d32d5f552f4e5b6' 
  AND token = '2OUD2mfmk4KSTb54A1jH+PjLeCVmxfiCkmRIv9K3BTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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