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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afeeae6df8de2cf6c837c9e66c29902ae7fb02273d12f49474cf3a8e2612a9c5' 
  AND token = 'vFSij3X+86guQNyaVCYvtZxbIFFyKDZdcddWoOkpZ8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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