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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8652456f31c8fa45a81c131b8f4cde5ef033be6f9ef9d3b0dd4ece9e1736ddfa' 
  AND token = 'BEGXCfJ/9mpxoyo7GLz1AVd0BDWX3hG0xJ95ykjayP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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