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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e723d92638b60ba231a5a70a6bdc6252a69666a1fa13fef8279dd39f73252d3' 
  AND token = 'QbpTN2mFd4JMA1VpvgvU7PvpeGJ/CuKEMNGE00tlmnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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