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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45c895c6c0b6a8b835181cb69056a4c79d8fd2b533fbc82c53c59c51d2c71c9a' 
  AND token = 'NqbzqJCCyOk1fusJVvy0KEyCXHigy8ybUWWF4s3/FsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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