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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54f547584f96ef5dee13217345e72d8529cc8f72128f4520c553710d5b782afe' 
  AND token = 'rl6+3bEIlGiomfeb7NLaoHxpaG3O284ysmzI0zOjytg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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