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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db25f602e1556194df1b1412f7e4963634f8eed6c7428d704ed934ba03aa1fbe' 
  AND token = 'p2E3X1U+s9b1zw0LyZUGz29qctYG/VHVLuBfWT46d6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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