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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd35c03671af08b26a7bc0c7c35b7d83cdfe107d5abb15dab41a812cd48ccc17' 
  AND token = 'K35qOQJ/FMtkxARzKk5YYvHatODxttCq9TFRtf7qRk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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