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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7798f69460922e1e937fb15de7ab63c33edc942967c541df1ad44bfd68f16b9' 
  AND token = 'EBa9IJSWpDa1EP3bNFODyAdQaBMyYhY7X1LJZokA/ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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