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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6d4fb2b1215366cf3c5ed17a877e83341e9d6a698683f04c3d6ae91b46565ea' 
  AND token = 'u4aBW0piiDWbgRbqmW8+mZdHZlG6AL6xCILzaBChwG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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