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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd96f2ad909948144803793db68f95816cbbced89c686108a0c0e1914bf8d6a0a' 
  AND token = 'm4DuBomfqtFGIOkD1ovrEVc1vhGtu7Z52dN2lYgMcJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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