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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3bfc54219618c326076b9b504551ed02b696cc77637b5ffc120a93b5df54d23' 
  AND token = '62u5V0UNDdUsFPqDEl620104tcwcyou7ESy7phDWSmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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