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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '963cc47957f5a79c876cb058be0fac5ebed42c3bd92ab653ce4c6c8f14bfb119' 
  AND token = 'RRW0vcKv8GnV0w5Imb7sRq81358nF5ZmXR/KeUHWRss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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