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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '987f8e9ad69fc3e56b381b1ef7a5f5e01fb5c72e2adc4e278a7a7ee013afa482' 
  AND token = '0hq9pxuowq9A6jTy/sKAOqxG6uUP5xp0THOPvZ5+8pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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