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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7145cd2bdb3257a3b56e76b423a6e483b28327035564d7283cb6fc2c8815ed9' 
  AND token = 'r+zdo4MmKOfbfoLfi2BtSo207X0f8nadIZsi/T6U2vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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