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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35959ad1b39cae4e6664c973f82aae6b45ed9b75fe0ec1fc9492d497ac7d4032' 
  AND token = 'eE1l5eBSF2jNkyFdbck6nBWwbpXeLfo7xHj27kRxiR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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