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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a9cd10c7cd458c4197d6785a1f5ce017b367ed09259ced623b86b04d60e448' 
  AND token = 'OoPI1S1bRlLuXGrlvZ2vero0U3yaG4707LzCNy+zWt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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