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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39098cfa5d3ee2f713ee9ffe39582c28639f784a9f3ca5abdaa29742088bccf0' 
  AND token = 'MW2WsPEFRBN6nQy4idRidml4f7zDk4fxyJlMre1LzaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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