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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1875dbdcf6962a4c9f4441d9f888d1253d8933f0fb845f5a25ebf9fff29b75d9' 
  AND token = 'r6FHbAIffKpt6FKEY2U1x4aeSiZkJTK/WfucL0GIQlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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