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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e76a1f8e4798b83ddb2a91e275c44d9f362627e922f02502670a9329a8f7b0ae' 
  AND token = 'm2u2uCy28SW42YgLstP3wjPh7vDDmCxhDNrgIv68IVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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