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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a82be8a6dd4b47c2ec1d2c0a65e49a7f8374df1ce6f8c148c679d1cc02ef5e9' 
  AND token = '7IVftWJ/4Wl7hhTQQCxMFfRXU+pBJkstLkNG9aU8l7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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