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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5256dcb0f0085597596597a9d463cbbeaf559ff61ea0c331dc8bd77d3bfd2493' 
  AND token = 'T+O37dVp08XzBv3DeGP/eNerGCeTY8aa9xAXcNHoOyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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