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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1591862b3d759412a2531b4d84afd570ee445c02fb10fa4f20de1af3190ea21' 
  AND token = 'hQGKLbDyFhiPffF8W6zU91wAImuHWEaMsWoc7EK4x/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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