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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd57451be156affd06c4ed680f6a6db63b1dad8fd23b6da12fe77bcc5981e79' 
  AND token = 'v5CL3ARMo8vbAifz2sNYyvOvQUur1buqNolk/sT+01Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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