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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a41ece0a39c2035ce1e3a896f9b7a8fd3423ef598e8f593f814778ba0ed4a2d' 
  AND token = 'wGMOagnPFu49frOg91Tw576LLYUzoqF9G5R+uP/Mor8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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