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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c1fc495f6e57033c7934c18799e70b05adde6d6a622d5f9ceee8cb31dc6e006' 
  AND token = 's0JQvAvM57yVupPn80eohLMYlw9x4Zo05O8t7IWMLns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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