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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c9f7d7ca7b21a0f5790e96dd031d842b708ea218bd66d473f42273f3500fa6' 
  AND token = 'ElmULf1Y+Iz3+F3REdAPDa43eDoGhNE7ZJin3BWtBdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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