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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef2430cf48b80382ef4d1f043633059f81bb0ff9163119cddbfc31d1d09be564' 
  AND token = 'Vd2uSCkjxYd5FXC4R7nVCIgyEFSQxbTseqD2tItHEzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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