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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94a8e319f8ed33c5206ceae7e1ea15490d0a1ae9004f059cc710e6f1c1d1963' 
  AND token = 'aA6HnN3xjGkpTACAMObrr1J1xyjXswFOyKF27FVr8EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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