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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb109ec61e74ddd852ec538243e9a9c020e94c13fb01b7a037facb74c3b96f3' 
  AND token = '/AeEYajQwo9mJCFq/8F6OZ8/UZvk5FafYdaPrvw80uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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