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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '699f6dca99c2692e8fe773c56720ead4d9837617b380f0215d8cff99c8e2ee8d' 
  AND token = 'Kly3/3HfpqukOWQAIHUia6iBgkZSSLP4v44GXTFouEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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