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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5514b3c5117fe0664307a4d423289d812c2c46f53413c19add840de75a2e64b0' 
  AND token = 'di3fKoLqptiSx6+8iQww6SF2UrMuT3SkUeOqPCf4g0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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