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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d54c6767a5b9adc029d3e522509a762224cf38b8d244ced18ca2d935d8b8625' 
  AND token = 'fqjIfycA6isJk9DbueXGpXY+prcaJQYkU8yOKyKq0iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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