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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e1fe7e41836772b87b22956c0b90ffd24e5ad028b4108db35d1185da5e3c5a' 
  AND token = 'd3yhgQUNtiu0qHK/HqaTzwkicOrd8KTuBAmADgres1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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