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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed66bee940410fed41bc59ca24b5a458b53d76d154d4db8e0ede0b5175aaee37' 
  AND token = '35m8k7PawoxcZp/Gekcb+eXw54yLkXUVtZktH7Vq10k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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