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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cc540b79c9131477d6ded114392acfb71742e66999618d64ad75fe55ba9b40f' 
  AND token = 'pBxzndC70LA9uleD3ppOgiU4oDcorRrJCzRSwKjfzCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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