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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddcf3aa63a09bb6951a0bacf9938655546dffcf633b03756efae12d131e76c42' 
  AND token = 'TeoYUpy3A7a4FEg+0s76ZRvgeCKNtsuDmF2iMLMz094=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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