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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6dd251bbdd9e84c9d113da69d59d122af896f4a4b7e237036cd4b99de20f15c' 
  AND token = 'bVyDcmdXJxNdaXwEchu1HPSLgxG+5m0YQs2unuCcejc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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