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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '870a63cc45396fcfa76001731a8e8bd3d8ca35778c84d08b826c3a680d17555f' 
  AND token = 'ckyM2dWrBiLg3tVcx00yZOduB8ib+XLNnrTSlUCnm8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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