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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aefb8a1cdf2856dade664d381671c94093b81df6e9e3ad8500287d376fb80ebc' 
  AND token = 'N438l8qPZkcOEOO0emu+QZZyn7HBuIC0a4UHu7Z2Zmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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