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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca05f27c1d7ad813ca0204c42b05886fefb9adb4962f50c4b31885040bc3f3f8' 
  AND token = 'qgh7ihnAaUiEW81PFSfbNJvN6L9wwy/Kfw2t193V7TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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