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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1de3a31125e1c6d6a6a9039676576639eaa9e0865de61f302d617aefed107daf' 
  AND token = '7pVC1bA9+A73en8/Spta35EPruGiJoe5DtxewlNZHxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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