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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a94d9b6a794514b1db7f003c7f824e2363d26b1a55d34ea9bb7a8214f30f8c96' 
  AND token = 'fmOYFoV5vWHa5jifVLPw1Z7BzSm0NtvBOMF7F0ktOQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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